Hello all" brand new here thanks for having me. I just started collecting just doing pennies at this point..I recently went through my penny jar all 20 lbs..AND I found 18 1982 penny's some with D mint marks some without any mint marks they all weigh 2.5 grams.but i also found 4 1982 penny"s that weigh 3.1+ grams 3 have D mint marks" 1 has no mint mark could someone please tell me what they think i'm fairly confident that there large dates but like i said i'm new and not very good at this'' thanks in advance..

One of the clues I use from fuzzy photos is the vertical shank on the '2'. If bent, it is a small date. If straight, it is the large date.
While not very clear, they all appear straight on those with MM of D. (Large dates.)